Routine blood tests are normal but the ECG shows a corrected QT interval of 480ms.. Propranolol

A 23-year-old woman is investigated after collapsing whilst jogging. She felt briefly unwell and dizzy prior to collapsing but quickly recovered. There has been no previous similar episodes. Routine blood tests are normal but the ECG shows a corrected QT interval of 480ms. What is the most appropriate management?
A.A Implantable cardioverter defibrillator
B.A Propranolol***
C.A Amiodarone
D.A Reassurance
E.A Accessory pathway ablation.
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